Need old version of Out-of-copyrite layer also available

Description

At the moment the current version of the Out-of-copyright background layer uses the new NPE maps from ​http://dev.openstreetmap.org/~timsc/wms2/map.php?, but this does not cover a lot of Scotland (just shows up as black tiles). Is is possible to have another option available that uses the old nick.dev.openstreetmap.org version, as this seems to contain tiles for Scotland (found this out by playing around with Josm).